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Long-Term Related Party Payable Long-Term Related Party Payable - Payable Balance (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Related Party Payable Rollforward:      
Related party payable, beginning balance $ 127,459 $ 169,347 $ 122,693
Additions     22,695
Payment of related party payable (9,668) (29,135) (24,227)
Fair value adjustments   (33,095) 59,124
Related party payable, ending balance $ 107,117 $ 107,117 $ 180,285